汽油机气缸盖底面通常铸有形状各异的凹坑,习惯上称这些凹坑为余隙。
参考答案:错
It's his laziness that____ his failure in the last exam.
[ ]
A. resulted from
B. resulted in
C. led into
D. brought in
()发动机在一个工作循环中要完成进气、压缩、作功和排气。
A、六行程
B、三行程
C、五行程
D、四行程